C++ KlassInfoEntry类代码示例

void KlassInfoBucket::iterate(KlassInfoClosure* cic) {
  KlassInfoEntry* elt = _list;
  while (elt != NULL) {
    cic->do_cinfo(elt);
    elt = elt->next();
  }
}

KlassInfoEntry* KlassInfoTable::lookup(Klass* k) {
  uint         idx = hash(k) % _size;
  assert(_buckets != NULL, "Allocation failure should have been caught");
  KlassInfoEntry*  e   = _buckets[idx].lookup(k);
  // Lookup may fail if this is a new klass for which we
  // could not allocate space for an new entry.
  assert(e == NULL || k == e->klass(), "must be equal");
  return e;
}

void KlassInfoBucket::empty() {
  KlassInfoEntry* elt = _list;
  _list = NULL;
  while (elt != NULL) {
    KlassInfoEntry* next = elt->next();
    delete elt;
    elt = next;
  }
}

KlassInfoEntry* KlassInfoBucket::lookup(const klassOop k) {
  KlassInfoEntry* elt = _list;
  while (elt != NULL) {
    if (elt->is_equal(k)) {
      return elt;
    }
    elt = elt->next();
  }
  elt = new KlassInfoEntry(k, list());
  set_list(elt);
  return elt;
}

// Return false if the entry could not be recorded on account
// of running out of space required to create a new entry.
bool KlassInfoTable::record_instance(const oop obj) {
  klassOop      k = obj->klass();
  KlassInfoEntry* elt = lookup(k);
  // elt may be NULL if it's a new klass for which we
  // could not allocate space for a new entry in the hashtable.
  if (elt != NULL) {
    elt->set_count(elt->count() + 1);
    elt->set_words(elt->words() + obj->size());
    return true;
  } else {
    return false;
  }
}

void KlassInfoHisto::print_class_stats(outputStream* st,
                                      bool csv_format, const char *columns) {
  ResourceMark rm;
  KlassSizeStats sz, sz_sum;
  int i;
  julong *col_table = (julong*)(&sz);
  julong *colsum_table = (julong*)(&sz_sum);
  int width_table[KlassSizeStats::_num_columns];
  bool selected[KlassSizeStats::_num_columns];

  _selected_columns = columns;

  memset(&sz_sum, 0, sizeof(sz_sum));
  for (int c=0; c<KlassSizeStats::_num_columns; c++) {
    selected[c] = is_selected(name_table[c]);
  }

  for(i=0; i < elements()->length(); i++) {
    elements()->at(i)->set_index(i+1);
  }

  for (int pass=1; pass<=2; pass++) {
    if (pass == 2) {
      print_title(st, csv_format, selected, width_table, name_table);
    }
    for(i=0; i < elements()->length(); i++) {
      KlassInfoEntry* e = (KlassInfoEntry*)elements()->at(i);
      const Klass* k = e->klass();

      memset(&sz, 0, sizeof(sz));
      sz._inst_count = e->count();
      sz._inst_bytes = HeapWordSize * e->words();
      k->collect_statistics(&sz);
      sz._total_bytes = sz._ro_bytes + sz._rw_bytes;

      if (pass == 1) {
        for (int c=0; c<KlassSizeStats::_num_columns; c++) {
          colsum_table[c] += col_table[c];
        }
      } else {
        int super_index = -1;
        if (k->oop_is_instance()) {
          Klass* super = ((InstanceKlass*)k)->java_super();
          if (super) {
            KlassInfoEntry* super_e = _cit->lookup(super);
            if (super_e) {
              super_index = super_e->index();
            }
          }
        }

        if (csv_format) {
          st->print("%d,%d", e->index(), super_index);
          for (int c=0; c<KlassSizeStats::_num_columns; c++) {
            if (selected[c]) {st->print("," JULONG_FORMAT, col_table[c]);}
          }
          st->print(",%s",e->name());
        } else {
          st->print("%5d %5d", e->index(), super_index);
          for (int c=0; c<KlassSizeStats::_num_columns; c++) {
            if (selected[c]) {print_julong(st, width_table[c], col_table[c]);}
          }
          st->print(" %s", e->name());
        }
        if (is_selected("ClassLoader")) {
          ClassLoaderData* loader_data = k->class_loader_data();
          st->print(",");
          loader_data->print_value_on(st);
        }
        st->cr();
      }
    }

    if (pass == 1) {
      for (int c=0; c<KlassSizeStats::_num_columns; c++) {
        width_table[c] = col_width(colsum_table[c], name_table[c]);
      }
    }
  }

  sz_sum._inst_size = 0;

  if (csv_format) {
    st->print(",");
    for (int c=0; c<KlassSizeStats::_num_columns; c++) {
      if (selected[c]) {st->print("," JULONG_FORMAT, colsum_table[c]);}
    }
  } else {
    st->print("           ");
    for (int c=0; c<KlassSizeStats::_num_columns; c++) {
      if (selected[c]) {print_julong(st, width_table[c], colsum_table[c]);}
    }
    st->print(" Total");
    if (sz_sum._total_bytes > 0) {
      st->cr();
      st->print("           ");
      for (int c=0; c<KlassSizeStats::_num_columns; c++) {
        if (selected[c]) {
          switch (c) {
          case KlassSizeStats::_index_inst_size:
//.........这里部分代码省略.........

void KlassHierarchy::print_class_hierarchy(outputStream* st, bool print_interfaces,
                                           bool print_subclasses, char* classname) {
  ResourceMark rm;
  Stack <KlassInfoEntry*, mtClass> class_stack;
  GrowableArray<KlassInfoEntry*> elements;

  // Add all classes to the KlassInfoTable, which allows for quick lookup.
  // A KlassInfoEntry will be created for each class.
  KlassInfoTable cit(true);
  if (cit.allocation_failed()) {
    st->print_cr("ERROR: Ran out of C-heap; hierarchy not generated");
    return;
  }

  // Add all created KlassInfoEntry instances to the elements array for easy
  // iteration, and to allow each KlassInfoEntry instance to have a unique index.
  HierarchyClosure hc(&elements);
  cit.iterate(&hc);

  for(int i = 0; i < elements.length(); i++) {
    KlassInfoEntry* cie = elements.at(i);
    const InstanceKlass* k = (InstanceKlass*)cie->klass();
    Klass* super = ((InstanceKlass*)k)->java_super();

    // Set the index for the class.
    cie->set_index(i + 1);

    // Add the class to the subclass array of its superclass.
    if (super != NULL) {
      KlassInfoEntry* super_cie = cit.lookup(super);
      assert(super_cie != NULL, "could not lookup superclass");
      super_cie->add_subclass(cie);
    }
  }

  // Set the do_print flag for each class that should be printed.
  for(int i = 0; i < elements.length(); i++) {
    KlassInfoEntry* cie = elements.at(i);
    if (classname == NULL) {
      // We are printing all classes.
      cie->set_do_print(true);
    } else {
      // We are only printing the hierarchy of a specific class.
      if (strcmp(classname, cie->klass()->external_name()) == 0) {
        KlassHierarchy::set_do_print_for_class_hierarchy(cie, &cit, print_subclasses);
      }
    }
  }

  // Now we do a depth first traversal of the class hierachry. The class_stack will
  // maintain the list of classes we still need to process. Start things off
  // by priming it with java.lang.Object.
  KlassInfoEntry* jlo_cie = cit.lookup(SystemDictionary::Object_klass());
  assert(jlo_cie != NULL, "could not lookup java.lang.Object");
  class_stack.push(jlo_cie);

  // Repeatedly pop the top item off the stack, print its class info,
  // and push all of its subclasses on to the stack. Do this until there
  // are no classes left on the stack.
  while (!class_stack.is_empty()) {
    KlassInfoEntry* curr_cie = class_stack.pop();
    if (curr_cie->do_print()) {
      print_class(st, curr_cie, print_interfaces);
      if (curr_cie->subclasses() != NULL) {
        // Current class has subclasses, so push all of them onto the stack.
        for (int i = 0; i < curr_cie->subclasses()->length(); i++) {
          KlassInfoEntry* cie = curr_cie->subclasses()->at(i);
          if (cie->do_print()) {
            class_stack.push(cie);
          }
        }
      }
    }
  }

  st->flush();
}

void KlassInfoHisto::print_class_stats(outputStream* st,
                                      bool csv_format, const char *columns) {
  ResourceMark rm;
  KlassSizeStats sz, sz_sum;
  int i;
  julong *col_table = (julong*)(&sz);
  julong *colsum_table = (julong*)(&sz_sum);
  int width_table[KlassSizeStats::_num_columns];
  bool selected[KlassSizeStats::_num_columns];

  _selected_columns = columns;

  memset(&sz_sum, 0, sizeof(sz_sum));
  for (int c=0; c<KlassSizeStats::_num_columns; c++) {
    selected[c] = is_selected(name_table[c]);
  }

  for(i=0; i < elements()->length(); i++) {
    elements()->at(i)->set_index(i+1);
  }

  // First iteration is for accumulating stats totals in colsum_table[].
  // Second iteration is for printing stats for each class.
  for (int pass=1; pass<=2; pass++) {
    if (pass == 2) {
      print_title(st, csv_format, selected, width_table, name_table);
    }
    for(i=0; i < elements()->length(); i++) {
      KlassInfoEntry* e = (KlassInfoEntry*)elements()->at(i);
      const Klass* k = e->klass();

      // Get the stats for this class.
      memset(&sz, 0, sizeof(sz));
      sz._inst_count = e->count();
      sz._inst_bytes = HeapWordSize * e->words();
      k->collect_statistics(&sz);
      sz._total_bytes = sz._ro_bytes + sz._rw_bytes;

      if (pass == 1) {
        // Add the stats for this class to the overall totals.
        for (int c=0; c<KlassSizeStats::_num_columns; c++) {
          colsum_table[c] += col_table[c];
        }
      } else {
        int super_index = -1;
        // Print the stats for this class.
        if (k->is_instance_klass()) {
          Klass* super = k->super();
          if (super) {
            KlassInfoEntry* super_e = _cit->lookup(super);
            if (super_e) {
              super_index = super_e->index();
            }
          }
        }

        if (csv_format) {
          st->print("%ld,%d", e->index(), super_index);
          for (int c=0; c<KlassSizeStats::_num_columns; c++) {
            if (selected[c]) {st->print("," JULONG_FORMAT, col_table[c]);}
          }
          st->print(",%s",e->name());
        } else {
          st->print("%5ld %5d", e->index(), super_index);
          for (int c=0; c<KlassSizeStats::_num_columns; c++) {
            if (selected[c]) {print_julong(st, width_table[c], col_table[c]);}
          }
          st->print(" %s", e->name());
        }
        if (is_selected("ClassLoader")) {
          ClassLoaderData* loader_data = k->class_loader_data();
          st->print(",");
          loader_data->print_value_on(st);
        }
        st->cr();
      }
    }

    if (pass == 1) {
      // Calculate the minimum width needed for the column by accounting for the
      // column header width and the width of the largest value in the column.
      for (int c=0; c<KlassSizeStats::_num_columns; c++) {
        width_table[c] = col_width(colsum_table[c], name_table[c]);
      }
    }
  }

  sz_sum._inst_size = 0;

  // Print the column totals.
  if (csv_format) {
    st->print(",");
    for (int c=0; c<KlassSizeStats::_num_columns; c++) {
      if (selected[c]) {st->print("," JULONG_FORMAT, colsum_table[c]);}
    }
  } else {
    st->print("           ");
    for (int c=0; c<KlassSizeStats::_num_columns; c++) {
      if (selected[c]) {print_julong(st, width_table[c], colsum_table[c]);}
    }
//.........这里部分代码省略.........

void KlassInfoTable::record_instance(const oop obj) {
  klassOop      k = obj->klass();
  KlassInfoEntry* elt = lookup(k);
  elt->set_count(elt->count() + 1);
  elt->set_words(elt->words() + obj->size());
}

KlassInfoEntry* KlassInfoTable::lookup(const klassOop k) {
  uint         idx = hash(k) % _size;
  KlassInfoEntry*  e   = _buckets[idx].lookup(k);
  assert(k == e->klass(), "must be equal");
  return e;
}